Nesting
Nesting is the technique of placing one formula or function inside another. The idea is that one function requires a value that can be delivered by another. The start date is provided by cell C4. YEARFRAC returns a decimal value like this in D4: which is passed directly to the INT function. The INT function removes the decimal portion of the number and returns 18 as a final result. More examples of nesting Nesting is a common technique in more advanced Excel formulas....